When I click the play or the record button, nothing happens. The program isn't frozen, everything else seems to be working fine, I've even opened my old projects and I could shift some stuff with no problems, but then I couldn't play it, it just doesn't react at all.
I've used the program yesterday and it worked just fine and no changes in settings happened since that. I've tried restarting the PC and re-opening Bitwig several times and all that, but I still have the same problem. Help please!

No no, that's not the problem.
It might be caused by some new Windows actualisation that changed something in the settings, but I've looked into it and everything should be working. I tried playing music in a basic mp3 player and it went through the headphones in my sound card that I normally use when recording, so the PC clearly communicates with it.